Explanipedia

Exploring the Photophysics of N-Type Polymer N2200 Open

William P. Kopcha, Melissa K. Gish, Ann L. Greenaway, Alivarani Mohapatra, Joshua M. Carr , et al. · 2024

The polymer interphase is a complex environment comprised of polymer chains, solvent molecules, and electrolyte ions. However, the microenvironments that these ingredients produce is both poorly-understood and difficult to investigate give…

Driving force controls charge separation distance in solid state organic donor/acceptors Open

Leo Romanetz, Melissa K. Gish, Joshua M. Carr, Garry Rumbles, Obadiah G. Reid · 2024

In this work, charge pairs of varying separation distance are interpreted from photoinduced absorption detected magnetic resonance (PADMR) spectroscopy of organic, small molecule dilute donor/acceptor thin films. We report that a donor/acc…

The Excited-State Lifetime of Poly(NDI2OD-T2) Is Intrinsically Short Open

Melissa K. Gish, Chamikara Karunasena, Joshua M. Carr, William P. Kopcha, Ann L. Greenaway , et al. · 2024

Conjugated polymers composed of alternating electron donor and acceptor segments have come to dominate the materials being considered for organic photoelectrodes and solar cells, in large part because of their favorable near-infrared absor…

Toward Mass-Production of Transition Metal Dichalcogenide Solar Cells: Scalable Growth of Photovoltaic-Grade Multilayer WSe2 by Tungsten Selenization Open

Kathryn M. Neilson, Sarallah Hamtaei, Koosha Nassiri Nazif, Joshua M. Carr, Sepideh Rahimisheikh , et al. · 2024

Semiconducting transition metal dichalcogenides (TMDs) are promising for high-specific-power photovoltaics due to desirable band gaps, high absorption coefficients, and ideally dangling-bond-free surfaces. Despite their potential, the majo…

Missing Excitons: How Energy Transfer Competes with Free Charge Generation in Dilute-Donor/Acceptor Systems Open

Joshua M. Carr, Melissa K. Gish, Obadiah G. Reid, Garry Rumbles · 2024

Energy transfer across the donor-acceptor interface in organic photovoltaics is usually beneficial to device performance, as it assists energy transport to the site of free charge generation. Here, we present a case where the opposite is t…

Observing Charge Separation Distance in Organic Donor-Acceptors with Photoinduced Absorption Detected Magnetic Resonance Spectroscopy Open

Leo Romanetz, Joshua M. Carr, Garry Rumbles, Obadiah G. Reid · 2023

The debatable role of charge transfer states in photoinduced charge separation to useful free carriers has been a long-standing controversy in the field of organic solar cells. In this work, varying charge-pair distances are measured in se…

Short and long-range electron transfer compete to determine free-charge yield in organic semiconductors Open